Out-of-bounds read in msgpack5 - #VU152783
Published: September 29, 2026
Vulnerability identifier: #VU152783
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: N/A
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the msgpack5 decoder when processing a truncated map32 header. A remote attacker can send truncated map32 data to cause a denial of service.
No adjacent memory is disclosed because buffer bounds are checked.
Affected software
msgpack5
Remediation
Install security update from vendor's website.
msgpack5 - update to 6.1.0